6. The following ciphertext PULCL YTHRL LEJLW APVUZ HULEJ LWAPV UKPZW YVCLZ AOLYBSL was obtained using...

 

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6. The following ciphertext PULCL YTHRL LEJLW APVUZ HULEJ LWAPV UKPZW YVCLZ AOLYBSL was obtained using a Vigenre cipher with a keyword of length p. Here is the frequency table for the letters in this ciphertext ABCDEFGHIJKLMNO 3 1 20 20 0 20 2 1 10 0 0 1 PQRSTUVWXYZ 40 1 1 1 4 3 3 0 3 3 (a) Compute the index of coincidence and use it to estimate the length of the keyword. (b) Decrypt the ciphertext. 6. The following ciphertext PULCL YTHRL LEJLW APVUZ HULEJ LWAPV UKPZW YVCLZ AOLYBSL was obtained using a Vigenre cipher with a keyword of length p. Here is the frequency table for the letters in this ciphertext ABCDEFGHIJKLMNO 3 1 20 20 0 20 2 1 10 0 0 1 PQRSTUVWXYZ 40 1 1 1 4 3 3 0 3 3 (a) Compute the index of coincidence and use it to estimate the length of the keyword. (b) Decrypt the ciphertext.

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Joe of Times A 3 B K Date A 20 S T 1 01 C E F 808 L U M P 03 N ... View the full answer